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02-28-2012, 09:55 AM   #1
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I descend from a family of Pentax camera owners- both film and digital, and I'm exploring the options available on my Pentax DSLR including the use of Dad's old manuel lens. BTW, I now have possession of the camera bag, camera & lenses that we were never allowed to touch!!! Take that little brother !

02-28-2012, 01:55 PM   #2
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Welcome Legalmom, Enjoy the forums and the manual lenses
04-23-2012, 12:06 PM   #3
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Welcome to the forum. One of the great things with Pentax is the ability to use all that great old glass (and of course the great newer glass like the LTD series both FA and DA)
04-23-2012, 01:07 PM   #4
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OK, I'll ask - what did Dad have in the kit?

04-24-2012, 09:15 AM   #5
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2 Pentax, a SMC 50mm F1.2, and 28mm F2.8 and a Sears 135 F2.8. I like the pictures from all of these, but need to work on getting them focused and the picture taken. I think a little practice will help.
04-24-2012, 09:23 AM   #6
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a 50 F1.2 WOW that's a nice lens, and worth a pretty penny too reviews of it are at the link. Focusing this lens wide open will be very difficult with the stock focusing screen. It is easier if you have live view (but not as convenient) or you can upgrade to a screen designed for ultra fast lenses like the Canon Ee screen

SMC Pentax 50mm F1.2 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database
04-24-2012, 09:42 AM   #7
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Never tried it with Live view. I still like the ol viewfinder. I did take some good pictures with nice bokeh of my daughter, but the pup pictures left a lot to be desired
04-24-2012, 09:47 AM   #8
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The 135 is surprisingly easier to get focused in. Some nice shots of horseback riding and kids outside. Not sure why I have so much more trouble with the wide-angle and the 50, but I will master it....

04-24-2012, 09:59 AM   #9
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the 135 likely has a couple of advantages over the 50. first would be you are further away from the subject (particularly to get a horse in frame) and shooting at a slower speed so the DOF is quite deep so easier to nail the focus zone

Online Depth of Field Calculator

will let you get an idea of how much will be in focus at any f stop and distance FL combination. Shooting head and shoulders with the 50 you are probably no more than 7-8 feet back
wide open @ 1.2 from 8 feet only .36 feet is going to be in focus (about 3 inches)
from 5 feet it's down to .14 feet or about 1.6 inches. easy to have eyes in focus and nose out or vice versa if you don't nail the right focus
04-24-2012, 10:26 AM   #10
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@eddie1960 - I've seen that site before but always good to be referred to it again. Now in tandem with the DOF calculation, is there an easy relationship between focal length and size of object in camera - i.e. if I'm standing 10ft away using a 50mm lens, what is the equivalent distance to stand away with a 100mm lens?
04-24-2012, 10:27 AM   #11
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QuoteOriginally posted by Legalmom Quote
Take that little brother !
Welcome to a friendly place. If you want to get revenge, take lots of pictures of said brother. If they prove to be "interesting", post them.
04-24-2012, 10:36 AM   #12
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QuoteOriginally posted by MSL Quote
@eddie1960 - I've seen that site before but always good to be referred to it again. Now in tandem with the DOF calculation, is there an easy relationship between focal length and size of object in camera - i.e. if I'm standing 10ft away using a 50mm lens, what is the equivalent distance to stand away with a 100mm lens?
I don't know of a calculator for that but your one is easy to get the same framing on the subject you would need to be 20 feet away. the DOF will be the same as well assuming you use the same F stop (I compared at F 2.8 since a faster 100 is a rare beast - 1.36 feet on the 50 @ 10 feet or the 100 @ 20 feet) There will still be differences in rendering of course as the formulas are different (hmm could be an interesting experiment, your assignment for tonight should you choose to accept is to shoot the same stationary item using a 50 from 10 feet and a 100 from 20 @ the same aperture and post results here )
04-24-2012, 10:39 AM   #13
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@eddie1960 - I was guessing it was linear, but hadn't tried to do the math to be sure. I have enough trouble with my kids homework, so I'll leave the exercise for the professor.
04-24-2012, 10:54 AM   #14
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QuoteOriginally posted by MSL Quote
@eddie1960 - I was guessing it was linear, but hadn't tried to do the math to be sure. I have enough trouble with my kids homework, so I'll leave the exercise for the professor.
i just flipped and looked at the lens reviews for some numbers. the math in this case was easy comparing an 85 1.4 and a 50 1.4 would have required a calculator
04-25-2012, 08:14 AM   #15
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Wow, that's an f 1.2 not an f1:2? Nice lens to play with!
Look up the thread on using manual lenses - and turn on the Catch-in-focus option, it will make life a lot easier.
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